US5221829A - Domestic cooking apparatus - Google Patents

Domestic cooking apparatus Download PDF

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Publication number
US5221829A
US5221829A US07/652,508 US65250891A US5221829A US 5221829 A US5221829 A US 5221829A US 65250891 A US65250891 A US 65250891A US 5221829 A US5221829 A US 5221829A
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US
United States
Prior art keywords
heating element
layer
foil heating
cooking apparatus
foil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/652,508
Other languages
English (en)
Inventor
Shimon Yahav
Yair Daar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lancet SA
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from IL95988A external-priority patent/IL95988A0/xx
Priority claimed from IL97117A external-priority patent/IL97117A/xx
Application filed by Individual filed Critical Individual
Priority to US07/963,560 priority Critical patent/US5374807A/en
Application granted granted Critical
Publication of US5221829A publication Critical patent/US5221829A/en
Priority to US08/391,623 priority patent/US5508495A/en
Assigned to LANCET S.A. reassignment LANCET S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAAR, YAIR, YAHAV, SHIMON
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the present invention relates to domestic cooking apparatus generally.
  • U.S. Pat. No. 4,073,970 describes a method of making an electric heating unit employing a sinuous strip of a gold/platinum alloy.
  • U.S. Pat. No. 4,347,432 describes a glass ceramic cooking appliance employing a heating coil which heats the glass ceramic by radiation.
  • U.S. Pat. No. 4,161,648 describes an electrical radiation heater for a glass ceramic plate which is spaced therefrom and heats the plate by radiation.
  • U.S. Pat. No. 3,869,596 describes a cookware heater employing a printed circuit foil type heating circuit which is bonded to a ceramic or metallic surface.
  • the present invention seeks to provide improved domestic cooking apparatus.
  • domestic cooking apparatus including a layer of material having high temperature thermal shock resistance and defining a first surface which is a planar cooking surface and a second surface, and a foil heating element disposed in heat transfer engagement with the second surface, wherein the foil heating element is operative to heat at least a portion of the material having high temperature thermal shock resistance to a temperature exceeding 200 degrees centigrade and preferably to a temperature exceeding 270 degrees centigrade.
  • the material having high temperature thermal shock resistance comprises ceramic glass or metal.
  • the foil heating element may be disposed in intimate touching relationship with the second surface.
  • the foil heating element provides heating of a density of at least 20 Watt per square inch of the area of the second surface generally overlying the overall region of the foil element.
  • the foil heating element provides heating of a density of at least 20 Watt per square inch of the area of the second surface subtended by the shortest closed planar convex curve circumscribing the projection thereon of the heating element of a cooking location excluding the electrical leads thereto.
  • At least one heat reflecting layer disposed under the foil heating element.
  • a foil heating element disposed in heat transfer engagement with the second surface of the material layer having high temperature thermal shock resistance, wherein the foil heating element is operative to heat at least a portion of the material having high temperature thermal shock resistance to a temperature exceeding 200 degrees centigrade.
  • the oven may also include an insulative layer disposed adjacent the foil heating element in intimate touching relationship therewith.
  • apparatus for governing the electrical power supplied to the foil heating element in accordance with the sensed temperature thereof is provided.
  • a layer of metal may be provided in thermal communication with the foil heating element for prevention of localized overheating of the planar cooking surface.
  • the metal is a metal having high thermal conductivity, such as aluminum.
  • the layer of metal is located intermediate the foil heating element and the planar cooking surface and thus receives heat from the foil heating element and in turn heats the planar cooking surface.
  • the layer of metal is located on a side of the foil heating element opposite from that of the planar cooking surface and serves to absorb heat from the foil heating element particularly from locations at which relatively less heat is absorbed by the planar cooking surface.
  • an insulative layer disposed underneath the foil heating element in intimate touching relationship therewith and spring apparatus for urging the insulative layer, the foil heating element and the material having high temperature thermal shock resistance and any intermediate layers associated therewith together in intimate engagement.
  • FIG. 1 is a pictorial illustration of cooking apparatus constructed and operative in accordance with a preferred embodiment of the present invention
  • FIG. 2 is a pictorial illustration of cooking apparatus constructed and operative in accordance with another preferred embodiment of the present invention
  • FIGS. 3A, 3B and 3C are each a partial sectional illustration taken along lines III--III of FIG. 1, for a different preferred embodiment of the invention
  • FIGS. 4A, 4B and 4C are illustrations of three different embodiments of foil heating element useful in the present invention.
  • FIG. 5 is an electrical schematic illustration of temperature sensing and controlling circuitry useful in the present invention.
  • FIG. 1 illustrates domestic cooking apparatus constructed and operative in accordance with a preferred embodiment of the invention.
  • the domestic cooking apparatus comprises a housing 10, the top surface of which is formed of a cooking surface layer 12 of material having high thermal shock resistance, enabling it to be heated to a temperature of at least 200 degrees centigrade and preferably to a temperature in excess of 270 degrees centigrade and up to or exceeding 600 degrees centigrade.
  • the cooking surface layer 12 is integrally formed with the top surface of the housing and defines on a top surface thereof a plurality of cooking locations 14.
  • the cooking surface layer at the cooking locations 14 may be formed of a material having high thermal shock resistance and the remaining portion of the top surface may be formed of a different material.
  • Presently preferred materials for use as the cooking surface layer 12 at least at the cooking locations 14 include ceramic glass, stainless steel or other suitable metals.
  • housing 10 Mounted on housing 10 are operating controls for the cooking locations 14, typically including an ON/OFF switch 16, power controls 18, and a display 20, indicating the operating status of each cooking location.
  • a timer and clock display assembly 22 may also be provided.
  • a foil heating element 30 is supported in intimate conductive heat transfer engagement underlying the thermal shock resistant cooking surface layer 12.
  • one or more electrically insulative, heat conductive insulative layers 32 may be interposed between foil heating element 30 and layer 12. Where layer 12 is formed of metal, such a layer 32 is required. Layer 32 may be formed of mica or of any other suitable material. Preferably the thickness of foil heating element 30 is less than 0.3 mm.
  • underlying heating element 30 Disposed underlying heating element 30 is at least one layer 34 of thermal and electrical insulation material, such as glass or mica. Underlying layer 34 is typically provided a relatively rigid layer 36 of a material, preferably a metal.
  • Urging heating element 30 into intimate heat transfer engagement with layer 12 is a spring, such as a wide leaf spring 38, which is preferably prestressed so as to be seated on housing 10 and to force rigid layer 36 against layers 30, 32 and 34 and forcing those layers against each other and against layer 12.
  • This arrangement provides intimate heat transfer engagement between the heating element 30 and the layer 12 while making provision for thermal displacements of the various layers.
  • a metal heat reflector 40 Disposed below spring 38 is preferably provided a metal heat reflector 40, typically formed of stainless steel or aluminum.
  • FIG. 3B illustrates an alternative embodiment of the invention similar to that of FIG. 3A and wherein the layer 12 is formed of ceramic glass.
  • the layer 12 is formed of ceramic glass.
  • These two additional layers are disposed between layers 34 and 36.
  • FIG. 3C illustrates a further alternative embodiment of the invention similar to that of FIG. 3A wherein the layer 12 is formed of ceramic glass.
  • a layer 31 formed of a metal having high thermal conductivity is provided underlying layer 12.
  • a layer 32, of the composition described above, must be provided in this case.
  • FIG. 2 illustrates an oven 42 which is constructed and operative in accordance with the present invention.
  • the oven is provided with a heating assembly 44 of the type illustrated in any of FIGS. 3A-3C, which heating assembly may be mounted upside down from the top of the oven or sideways along the oven walls.
  • FIGS. 4A, 4B and 4C illustrate three typical configurations of a foil heating element.
  • the overall configuration is rectangular, while in the embodiment of FIG. 4B, the overall configuration is nearly circular and in the embodiment of FIG. 4C, the overall configuration is polygonal.
  • the foil heating element 30 provides a heat output density of at least 20 Watt per square inch of area of the cooking surface layer 12 generally overlying the overall region of the foil heating element.
  • the foil heating element preferably provides heating of a density of at least 20 Watt per square inch of the area 52 of the cooking surface subtended by the shortest closed planar convex curve circumscribing the projection thereon of the heating element of a cooking location excluding the electrical leads 50 thereto.
  • Preferable heat output densities are above 30 Watt per square inch and may exceed 70 Watt per square inch.
  • the foil heating element provides a heat output exceeding 0.8 KW. It is also preferable, from a cooking heat efficiency standpoint, that the foil heating element forming part of a cooking surface be fully covered by the bottom surface of a cooking utensil during operation.
  • FIG. 5 is a schematic illustration of circuitry for sensing and controlling the temperature of the foil heating element 30.
  • Portion 60 of the circuitry serves to sense the resistance of the heating element 30 by sampling the current passing therethrough, which is proportional to the resistance thereof, and related to the temperature of the cooking surface layer 12.
  • Portion 60 is operative to compare the temperature of the foil heating element with a preset desired temperature while portion 62 of the circuitry operates to vary the electrical power supplied to the heating element 30 to maintain the desired temperature. By governing the temperature of the heating element 30, undesired overheating of the cooking surface layer 12 is prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Control Of Resistance Heating (AREA)
  • Cookers (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Electric Stoves And Ranges (AREA)
  • Disintegrating Or Milling (AREA)
  • Control Of Temperature (AREA)
  • Surface Heating Bodies (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US07/652,508 1990-10-15 1991-02-08 Domestic cooking apparatus Expired - Fee Related US5221829A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07/963,560 US5374807A (en) 1990-10-15 1992-10-20 Domestic cooking apparatus
US08/391,623 US5508495A (en) 1990-10-15 1995-02-21 Domestic cooking apparatus

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IL95988 1990-10-15
IL95988A IL95988A0 (en) 1990-10-15 1990-10-15 Heating apparatus
IL97117 1991-01-31
IL97117A IL97117A (en) 1991-01-31 1991-01-31 Domestic cooking apparatus

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US07/963,560 Continuation US5374807A (en) 1990-10-15 1992-10-20 Domestic cooking apparatus

Publications (1)

Publication Number Publication Date
US5221829A true US5221829A (en) 1993-06-22

Family

ID=26322142

Family Applications (3)

Application Number Title Priority Date Filing Date
US07/652,508 Expired - Fee Related US5221829A (en) 1990-10-15 1991-02-08 Domestic cooking apparatus
US07/963,560 Expired - Fee Related US5374807A (en) 1990-10-15 1992-10-20 Domestic cooking apparatus
US08/391,623 Expired - Fee Related US5508495A (en) 1990-10-15 1995-02-21 Domestic cooking apparatus

Family Applications After (2)

Application Number Title Priority Date Filing Date
US07/963,560 Expired - Fee Related US5374807A (en) 1990-10-15 1992-10-20 Domestic cooking apparatus
US08/391,623 Expired - Fee Related US5508495A (en) 1990-10-15 1995-02-21 Domestic cooking apparatus

Country Status (13)

Country Link
US (3) US5221829A (de)
EP (1) EP0481162B1 (de)
JP (1) JPH05101870A (de)
KR (1) KR920008419A (de)
AT (1) ATE153210T1 (de)
AU (1) AU644654B2 (de)
CA (1) CA2051861C (de)
DE (2) DE69126088T2 (de)
ES (1) ES2031799T3 (de)
IE (1) IE911713A1 (de)
MX (1) MX9100248A (de)
NZ (1) NZ238348A (de)
PT (1) PT98218B (de)

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DE9409002U1 (de) * 1994-05-27 1994-07-28 Koch GmbH & Co. KG, 35716 Dietzhölztal Tischkochgerät
US5374807A (en) * 1990-10-15 1994-12-20 Yahav; Shimon Domestic cooking apparatus
US5467695A (en) * 1993-09-29 1995-11-21 Blanco Gmbh & Co. Kg Device for preparing foods
WO1996012387A1 (en) * 1994-10-18 1996-04-25 Redring Electric Limited Electric hob
US5577158A (en) * 1995-07-17 1996-11-19 White Consolidated Industries, Inc. Capacitive leakage current cancellation for heating panel
US5782172A (en) * 1992-10-08 1998-07-21 Schacht; Paul Appliance for low and high-heat cooking
US5932128A (en) * 1997-02-26 1999-08-03 White Consolidated Industries, Inc. Switching control system for heating panel with leakage current cancellation
US5940579A (en) * 1997-02-26 1999-08-17 White Consolidated Industries, Inc. Capacitive leakage current cancellation for heating panel
US6037572A (en) * 1997-02-26 2000-03-14 White Consolidated Industries, Inc. Thin film heating assemblies
US6297482B1 (en) 2000-07-26 2001-10-02 Maytag Corporation Ceramic-based downdraft cooktop having angled front face portion
US6501053B2 (en) 2000-07-26 2002-12-31 Maytag Corporation Control system for an appliance cooktop
US20040042770A1 (en) * 2002-09-03 2004-03-04 Samsung Nec Mobile Display Co., Ltd. Heating crucible for organic thin film forming apparatus
DE10250317A1 (de) * 2002-10-29 2004-06-03 Schott Glas Glas- oder Glaskeramikplatte mit einer elektrischen Heizeinheit
US20210251046A1 (en) * 2020-02-10 2021-08-12 Lexmark International, Inc. Cooking device having a modular ceramic heater
US11435088B2 (en) * 2018-08-21 2022-09-06 Lg Electronics Inc. Electric heater and cooking appliance having same
US11666170B2 (en) 2019-02-08 2023-06-06 Lexmark International, Inc. Cooking device having a cooking vessel and a ceramic heater
US11692754B2 (en) 2020-04-21 2023-07-04 Lexmark International, Inc. Ice maker heater assemblies
US11903472B2 (en) 2019-02-08 2024-02-20 Lexmark International, Inc. Hair iron having a ceramic heater

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JP3020782B2 (ja) * 1993-10-18 2000-03-15 株式会社東芝 加熱調理器の平面ヒータ
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CN105231902B (zh) * 2015-11-04 2017-10-03 深圳国创名厨商用设备制造有限公司南海分公司 一种无油烟的高温烧烤炉
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JP6743299B2 (ja) * 2017-05-29 2020-08-19 京セラ株式会社 試料保持具
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US5374807A (en) * 1990-10-15 1994-12-20 Yahav; Shimon Domestic cooking apparatus
US5508495A (en) * 1990-10-15 1996-04-16 Yahav; Shimon Domestic cooking apparatus
US5782172A (en) * 1992-10-08 1998-07-21 Schacht; Paul Appliance for low and high-heat cooking
US5467695A (en) * 1993-09-29 1995-11-21 Blanco Gmbh & Co. Kg Device for preparing foods
DE9409002U1 (de) * 1994-05-27 1994-07-28 Koch GmbH & Co. KG, 35716 Dietzhölztal Tischkochgerät
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US5577158A (en) * 1995-07-17 1996-11-19 White Consolidated Industries, Inc. Capacitive leakage current cancellation for heating panel
US5932128A (en) * 1997-02-26 1999-08-03 White Consolidated Industries, Inc. Switching control system for heating panel with leakage current cancellation
US5940579A (en) * 1997-02-26 1999-08-17 White Consolidated Industries, Inc. Capacitive leakage current cancellation for heating panel
US6037572A (en) * 1997-02-26 2000-03-14 White Consolidated Industries, Inc. Thin film heating assemblies
US6297482B1 (en) 2000-07-26 2001-10-02 Maytag Corporation Ceramic-based downdraft cooktop having angled front face portion
US6501053B2 (en) 2000-07-26 2002-12-31 Maytag Corporation Control system for an appliance cooktop
US20040042770A1 (en) * 2002-09-03 2004-03-04 Samsung Nec Mobile Display Co., Ltd. Heating crucible for organic thin film forming apparatus
US7962016B2 (en) * 2002-09-03 2011-06-14 Samsung Mobile Display Co., Ltd. Heating crucible for organic thin film forming apparatus
DE10250317A1 (de) * 2002-10-29 2004-06-03 Schott Glas Glas- oder Glaskeramikplatte mit einer elektrischen Heizeinheit
US20040149724A1 (en) * 2002-10-29 2004-08-05 Martin Taplan Glass or glass ceramic cooking top with an electrical heating unit
DE10250317B4 (de) * 2002-10-29 2004-10-28 Schott Glas Glas- oder Glaskeramikplatte mit einer elektrischen Heizeinheit
US6875957B2 (en) 2002-10-29 2005-04-05 Scott Glas Glass or glass ceramic cooking top with an electrical heating unit
ES2249102A1 (es) * 2002-10-29 2006-03-16 Schott Glas Placa de vidrio o vitroceramica con una unidad calefactora electrica.
US11435088B2 (en) * 2018-08-21 2022-09-06 Lg Electronics Inc. Electric heater and cooking appliance having same
US11666170B2 (en) 2019-02-08 2023-06-06 Lexmark International, Inc. Cooking device having a cooking vessel and a ceramic heater
US11903472B2 (en) 2019-02-08 2024-02-20 Lexmark International, Inc. Hair iron having a ceramic heater
US20210251046A1 (en) * 2020-02-10 2021-08-12 Lexmark International, Inc. Cooking device having a modular ceramic heater
US11692754B2 (en) 2020-04-21 2023-07-04 Lexmark International, Inc. Ice maker heater assemblies

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JPH05101870A (ja) 1993-04-23
MX9100248A (es) 1992-06-05
AU644654B2 (en) 1993-12-16
ATE153210T1 (de) 1997-05-15
CA2051861C (en) 1998-10-27
AU7800891A (en) 1992-04-16
EP0481162A3 (en) 1992-12-09
EP0481162A2 (de) 1992-04-22
ES2031799T3 (es) 1997-10-01
EP0481162B1 (de) 1997-05-14
US5374807A (en) 1994-12-20
PT98218B (pt) 1999-01-29
KR920008419A (ko) 1992-05-28
US5508495A (en) 1996-04-16
ES2031799T1 (es) 1993-01-01
DE481162T1 (de) 1992-07-02
DE69126088T2 (de) 1997-12-18
PT98218A (pt) 1993-08-31
NZ238348A (en) 1993-12-23
IE911713A1 (en) 1992-04-22
CA2051861A1 (en) 1992-04-16
DE69126088D1 (de) 1997-06-19

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